mirror of https://github.com/hashicorp/consul
67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
package testutil
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import (
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"fmt"
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"testing"
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"time"
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"github.com/hashicorp/consul/consul/structs"
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"github.com/pkg/errors"
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)
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type testFn func() (bool, error)
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const (
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baseWait = 1 * time.Millisecond
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maxWait = 100 * time.Millisecond
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)
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func WaitForResult(try testFn) error {
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var err error
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wait := baseWait
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for retries := 100; retries > 0; retries-- {
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var success bool
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success, err = try()
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if success {
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time.Sleep(25 * time.Millisecond)
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return nil
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}
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time.Sleep(wait)
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wait *= 2
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if wait > maxWait {
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wait = maxWait
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}
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}
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if err != nil {
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return errors.Wrap(err, "timed out with error")
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} else {
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return fmt.Errorf("timed out")
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}
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}
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type rpcFn func(string, interface{}, interface{}) error
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func WaitForLeader(t *testing.T, rpc rpcFn, dc string) structs.IndexedNodes {
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var out structs.IndexedNodes
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if err := WaitForResult(func() (bool, error) {
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// Ensure we have a leader and a node registration.
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args := &structs.DCSpecificRequest{
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Datacenter: dc,
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}
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if err := rpc("Catalog.ListNodes", args, &out); err != nil {
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return false, fmt.Errorf("Catalog.ListNodes failed: %v", err)
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}
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if !out.QueryMeta.KnownLeader {
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return false, fmt.Errorf("No leader")
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}
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if out.Index == 0 {
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return false, fmt.Errorf("Consul index is 0")
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}
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return true, nil
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}); err != nil {
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t.Fatalf("failed to find leader: %v", err)
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}
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return out
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}
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